How to resolve the Unexpected Error occurred when doing a Item record update using CSV Import

Scenario:

Performing a CSV Import to update Item Record > Result unsuccessful > CSV response shows Error: Unexpected error has occurred.

Solution:

Checked if Feature Allow Purchase of Assembly Items is enabled:

1. Navigate through Setup > Accounting > Accounting Preferences > Order Management tab > Allow Purchase of Assembly Items
2. If Allow Purchase of Assembly Items is True, CSV Import file needs to have another column for Purchase Unit.

Once feature is enabled into the account, the Purchase Unit becomes mandatory. Thus, updating item records originally created without purchase unit needs to be included in the CSV file and update to add Purchase Item for the CSV to complete.